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PROPERTY AND EQUIPMENT (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2011
Mar. 31, 2012
Minera Andes
Sep. 30, 2012
Trucks and trailers
Dec. 31, 2011
Trucks and trailers
Sep. 30, 2012
Office furniture and equipment
Dec. 31, 2011
Office furniture and equipment
Sep. 30, 2012
Drill rigs
Jun. 30, 2012
Drill rigs
item
Dec. 31, 2011
Drill rigs
Mar. 31, 2012
Drill rigs
Minera Andes
Sep. 30, 2012
Building
Dec. 31, 2011
Building
Sep. 30, 2012
Land
Dec. 31, 2011
Land
Sep. 30, 2012
Mining equipment
Dec. 31, 2011
Mining equipment
Sep. 30, 2012
Inactive milling equipment
Dec. 31, 2011
Inactive milling equipment
Sep. 30, 2012
Inactive milling equipment, mobile homes and vehicles
PROPERTY AND EQUIPMENT                                          
Subtotal $ 16,148,000 $ 16,148,000 $ 14,089,000   $ 1,417,000 $ 1,247,000 $ 1,054,000 $ 638,000 $ 1,869,000   $ 998,000   $ 1,469,000 $ 853,000 $ 8,669,000 $ 8,619,000 $ 1,026,000 $ 956,000 $ 644,000 $ 778,000  
Less: accumulated depreciation (2,665,000) (2,665,000) (2,317,000)                                    
Total 13,483,000 13,483,000 11,772,000                                   100,000
Additional investment in property and equipment       1,600,000               1,000,000                  
Number of drill rigs sold                   4                      
Impairment 2,902,000 3,081,000               200,000                      
Proceeds from sale of productive assets                 1,800,000                       1,400,000
Net realizable value of long-lived assets held for sale                   $ 1,800,000